capacity for learning, reasoning, understanding, and similar forms of mental activity; aptitude in grasping truths, relationships, facts, meanings, etc.
manifestation of a high mental capacity: He writes with intelligence and wit.
the faculty of understanding.
knowledge of an event, circumstance, etc., received or imparted; news; information.
the gathering or distribution of information, especially secret information.
information about an enemy or a potential enemy.
the evaluated conclusions drawn from such information.
an organization or agency engaged in gathering such information: military intelligence; naval intelligence.
interchange of information: They have been maintaining intelligence with foreign agents for years.
Christian Science. a fundamental attribute of God, or infinite Mind.
(often initial capital letter) an intelligent being or spirit, especially an incorporeal one, as an angel.

1350–1400; Middle English < Latin intelligentia. See intelligent, -ence

hyperintelligence, noun
nonintelligence, noun
preintelligence, noun
superintelligence, noun

1. See mind. 2. discernment, reason, acumen, aptitude, penetration.

2. stupidity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intelligence (ɪnˈtɛlɪdʒəns)
1.  the capacity for understanding; ability to perceive and comprehend meaning
2.  good mental capacity: a person of intelligence
3.  old-fashioned news; information
4.  military information about enemies, spies, etc
5.  a group or department that gathers or deals with such information
6.  (often capital) an intelligent being, esp one that is not embodied
7.  (modifier) of or relating to intelligence: an intelligence network
[C14: from Latin intellegentia, from intellegere to discern, comprehend, literally: choose between, from inter- + legere to choose]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "faculty of understanding," from O.Fr. intelligence (12c.), from L. intelligentia "understanding," from intelligentem (nom. intelligens) "discerning," prp. of intelligere "to understand, comprehend," from inter- "between" + legere "choose, pick out, read" (see
lecture). Meaning superior understanding, sagacity" is from early 15c. Sense of "information, news" first recorded mid-15c., especially "secret information from spies" (1580s). Intelligence quotient first recorded 1922 (see I.Q.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

intelligence in·tel·li·gence (ĭn-těl'ə-jəns)

  1. The capacity to acquire and apply knowledge, especially toward a purposeful goal.

  2. An individual's relative standing on two quantitative indices, namely measured intelligence, as expressed by an intelligence quotient, and effectiveness of adaptive behavior.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They live secret lives, surviving on stealth and intelligence.
Many explanations for the evolution of primate intelligence relate to the
  challenges of finding food.
The idea of the neurons' centrality to social intelligence is gaining ground.
Low hanging fruit from a guy who should have the experience and intelligence to
  dig deeper.
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